/*
计算阴历, 节气等
*/
interface Calendar {
  gregorianYear?: Number //公历年
  gregorianMonth?: String //公历月
  gregorianDay?: String //公历日
  weekday?: String //星期
  hours?: String
  minutes?: String
  seconds?: String

  lunarYear?: Number //农历年
  lunarMonth?: Number //农历月
  lunarDay?: Number //农历日

  lunarYearCn?: String //农历天干地支纪年
  lunarMonthCn?: String //农历中文月
  lunarDayCn?: String //农历中文日
  zodiacYear?: String //农历生肖年

  solarTerm?: String //节气
  gregorianFestival?: String //公历节日
  lunarFestival?: String //农历节日
}

let lunarInfo = [
  0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2, 0x04ae0,
  0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0, 0x14977, 0x04970, 0x0a4b0,
  0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970, 0x06566, 0x0d4a0, 0x0ea50,
  0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950, 0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0,
  0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557, 0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5d0,
  0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0, 0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260,
  0x0f263, 0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558,
  0x0b540, 0x0b5a0, 0x195a6, 0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46,
  0x0ab60, 0x09570, 0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5,
  0x092e0, 0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5,
  0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930, 0x07954,
  0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530, 0x05aa0, 0x076a3,
  0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45, 0x0b5a0, 0x056d0, 0x055b2,
  0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0
]

let zodiacs = ['鼠', '牛', '虎', '兔', '龙', '蛇', '马', '羊', '猴', '鸡', '狗', '猪']
let Gan = ['甲', '乙', '丙', '丁', '戊', '己', '庚', '辛', '壬', '癸']
let Zhi = ['子', '丑', '寅', '卯', '辰', '巳', '午', '未', '申', '酉', '戌', '亥']
let weekday = ['星期一', '星期二', '星期三', '星期四', '星期五', '星期六', '星期日']

//==== 传入 offset 传回干支, 0=甲子
function cyclical(num: number) {
  return Gan[num % 10] + Zhi[num % 12]
}

//==== 传回农历 year年的总天数
function lYearDays(year: number) {
  let i,
    sum = 348
  for (i = 0x8000; i > 0x8; i >>= 1) {
    sum += lunarInfo[year - 1900] & i ? 1 : 0
  }
  return sum + leapDays(year)
}

//==== 传回农历 year年闰月的天数
function leapDays(year: number) {
  if (leapMonth(year)) {
    return lunarInfo[year - 1900] & 0x10000 ? 30 : 29
  } else {
    return 0
  }
}

//==== 传回农历 year年闰哪个月 1-12 , 没闰传回 0
function leapMonth(year: number) {
  return lunarInfo[year - 1900] & 0xf
}

//==== 传回农历 year年month月的总天数
function monthDays(year: number, month: number) {
  return lunarInfo[year - 1900] & (0x10000 >> month) ? 30 : 29
}

//==== 算出农历, 传入日期对象, 传回农历日期对象
//     该对象属性有 农历年year 农历月month 农历日day 是否闰年isLeap yearCyl dayCyl monCyl
function Lunar(objDate: Date) {
  let i,
    temp = 0
  let baseDate = new Date(1900, 0, 31)
  let offset = Math.floor((objDate.getTime() - baseDate.getTime()) / 86400000)

  let dayCyl = offset + 40
  let monCyl = 14

  for (i = 1900; i < 2050 && offset > 0; i++) {
    temp = lYearDays(i)
    offset -= temp
    monCyl += 12
  }
  if (offset < 0) {
    offset += temp
    i--
    monCyl -= 12
  }
  //农历年
  let year = i
  let yearCyl = i - 1864

  let leap = leapMonth(i) //闰哪个月
  let isLeap = false //是否闰年

  for (i = 1; i < 13 && offset > 0; i++) {
    //闰月
    if (leap > 0 && i === leap + 1 && isLeap === false) {
      --i
      isLeap = true
      temp = leapDays(year)
    } else {
      temp = monthDays(year, i)
    }

    //解除闰月
    if (isLeap === true && i === leap + 1) {
      isLeap = false
    }

    offset -= temp
    if (isLeap === false) {
      monCyl++
    }
  }

  if (offset === 0 && leap > 0 && i === leap + 1)
    if (isLeap) {
      isLeap = false
    } else {
      isLeap = true
      --i
      --monCyl
    }

  if (offset < 0) {
    offset += temp
    --i
    --monCyl
  }
  //农历月
  let month = i
  //农历日
  let day = offset + 1

  return {
    year: year,
    month: month,
    day: day,
    isLeap: isLeap,
    leap: leap,
    yearCyl: yearCyl,
    dayCyl: dayCyl,
    monCyl: monCyl
  }
}

//==== 中文日期 m为传入月份，d为传入日期
function cDay(m: number, d: number) {
  let nStr1 = ['日', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十']
  let nStr2 = ['初', '十', '廿', '卅', '']
  //农历中文月
  let lunarMonthCn
  //农历中文日
  let lunarDayCn
  if (m > 10) {
    lunarMonthCn = '十' + nStr1[m - 10]
  } else {
    lunarMonthCn = nStr1[m]
  }
  lunarMonthCn += '月'

  switch (d) {
    case 10:
      lunarDayCn = '初十'
      break
    case 20:
      lunarDayCn = '二十'
      break
    case 30:
      lunarDayCn = '三十'
      break
    default:
      lunarDayCn = nStr2[Math.floor(d / 10)] + nStr1[d % 10]
  }
  return {
    lunarMonthCn: lunarMonthCn,
    lunarDayCn: lunarDayCn
  }
}

//节气
function getSolarTerm(GY: number, GM: number, GD: number) {
  let sTermInfo: number[] = [
    0, 21208, 42467, 63836, 85337, 107014, 128867, 150921, 173149, 195551, 218072, 240693, 263343,
    285989, 308563, 331033, 353350, 375494, 397447, 419210, 440795, 462224, 483532, 504758
  ]
  let solarTerm: string[] = [
    '小寒',
    '大寒',
    '立春',
    '雨水',
    '惊蛰',
    '春分',
    '清明',
    '谷雨',
    '立夏',
    '小满',
    '芒种',
    '夏至',
    '小暑',
    '大暑',
    '立秋',
    '处暑',
    '白露',
    '秋分',
    '寒露',
    '霜降',
    '立冬',
    '小雪',
    '大雪',
    '冬至'
  ]

  let solarTerms: string = ''
  let tmp1 = new Date(
    31556925974.7 * (GY - 1900) + sTermInfo[GM * 2 + 1] * 60000 + Date.UTC(1900, 0, 6, 2, 5)
  )
  let tmp2 = tmp1.getUTCDate()
  if (tmp2 === GD) solarTerms = solarTerm[GM * 2 + 1]
  tmp1 = new Date(
    31556925974.7 * (GY - 1900) + sTermInfo[GM * 2] * 60000 + Date.UTC(1900, 0, 6, 2, 5)
  )
  tmp2 = tmp1.getUTCDate()
  if (tmp2 === GD) solarTerms = solarTerm[GM * 2]

  return solarTerms
}

function lunarDate(d: number) {
  let now = new Date(d)

  //用于计算农历年月日的数据
  let GY = now.getFullYear()
  let GM = now.getMonth()
  let GD = now.getDate()

  let year = now.getFullYear()
  let _month = now.getMonth() + 1
  let _date = now.getDate()
  let _hours = now.getHours()
  let _minutes = now.getMinutes()
  let _seconds = now.getSeconds()
  let month = _month.toString().padStart(2, '0')
  let date = _date.toString().padStart(2, '0')
  let hours = _hours.toString().padStart(2, '0')
  let minutes = _minutes.toString().padStart(2, '0')
  let seconds = _seconds.toString().padStart(2, '0')

  let calendar: Calendar = {}
  //公历年月日、星期、时分秒
  calendar.gregorianYear = year
  calendar.gregorianMonth = month
  calendar.gregorianDay = date
  calendar.weekday = weekday[now.getDay()]
  calendar.hours = hours
  calendar.minutes = minutes
  calendar.seconds = seconds

  //去掉时分秒的日期
  let sDObj = new Date(GY, GM, GD)
  let lDObj = Lunar(sDObj)

  //农历年月日、生肖年
  calendar.lunarYear = lDObj.year
  calendar.lunarMonth = lDObj.month
  calendar.lunarDay = lDObj.day
  calendar.zodiacYear = zodiacs[(GY - 4) % 12]

  //农历中文年月日
  calendar.lunarYearCn = cyclical(GY - 1900 + 36)
  calendar.lunarMonthCn = cDay(lDObj.month, lDObj.day).lunarMonthCn
  calendar.lunarDayCn = cDay(lDObj.month, lDObj.day).lunarDayCn
  //节气
  calendar.solarTerm = getSolarTerm(GY, GM, GD)
  return calendar
}

export default lunarDate
